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首页> 外文期刊>Journal of Materials Engineering and Performance >Discontinuous Dynamic Recrystallization Mechanism and Twinning Evolution during Hot Deformation of Incoloy 825
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Discontinuous Dynamic Recrystallization Mechanism and Twinning Evolution during Hot Deformation of Incoloy 825

机译：Incoloy 825热变形过程中不连续的动态再结晶机制和孪生演化

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Discontinuous dynamic recrystallization (DDRX), which involves multiple nucleation and grain growth processes, plays a crucial role in grain refinement; however, the underlying mechanism and the significant role of twin boundaries (TBs) remain poorly understood. Here, the evolution of characteristic microstructures and the fraction and density of TBs under different deformation conditions (i.e., 1050-1200 degrees C, 0.001-1 s(-1)) in Incoloy 825 was investigated through a thermomechanical simulator, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). The first strand of recrystallized grains nucleated along the original grain boundaries (GBs), separated by the newly formed random high-angle grain boundaries (HAGBs), which were transformed from low-angle grain boundaries (LAGBs) and pre-existing TBs. Subsequently, straight TBs forming in the new grains increased the misorientation angle, promoting the migration of stagnated grain boundaries, and parts of newly generated twinning chains at the front of the recrystallization zone converted into random HAGBs, providing sites for the following layer of nucleation. Moreover, triple junctions between the recrystallized and deformed grains also served as potential nucleation sites when the LAGBs in the large misorientation gradient were transformed into random HAGBs. Quantitative relationships between the recrystallized grain size and TB density were obtained.
机译：不连续的动态重结晶（DDRX），涉及多种成核和晶粒生长过程，在谷物细化中起着至关重要的作用;然而，潜在的机制和双界（TBS）的重要作用仍然很清楚。这里，通过热机械模拟器研究了在灌注器825中不同变形条件下的特征微观结构和TBS的馏分和馏分和密度的馏分和密度，电子反向散射衍射（ EBSD）和透射电子显微镜（TEM）。沿着原始晶粒边界（GBS）的第一股重结晶晶体核化，由新形成的随机大角晶界（HAGB）分离，其从低角度晶界（LAGB）和预先存在的TBS转化。随后，在新晶粒中形成的直TBS增加了无论如何增加了无论如何，促进停滞的晶界的迁移，并在重结晶区前面的新产生的孪生链条转化成随机牙龈，为以下核化层提供了位点。此外，重结晶和变形晶粒之间的三重交叉点也用作潜在的成核位点，当大错位梯度的滞后转化成随机的Hagbs时。获得重结晶晶粒尺寸和Tb密度之间的定量关系。

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